Optimal Switching Scheme for Multistage Reluctance Coilgun

Hassannia, Amir; Abedi, Khalil

doi:10.1109/tps.2021.3061299

Cited by 13 publications

(10 citation statements)

References 29 publications

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“…When the current flows in any direction in the coil, the generated magnetic field excites the projectile in the same direction and attracts the projectile to move toward the center of the coil [6,10,11]. The schematic diagram of a REML is shown in Fig.…”

Section: Theoretical Analysis Of the Solving Methodsmentioning

confidence: 99%

“…Therefore, it is meaningful to calculate the position curve of the projectile and estimate the time when it reaches the center of the coil. REML can also use pulsed traveling wave magnetic field to launch similar to a cylindrical linear motor [6]. Considering the influence of dynamic inductance on electromagnetic force in this condition can provide a theoretical basis for stable thrust control.…”

Section: Introductionmentioning

confidence: 99%

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Research on Electromagnetic Dynamics Algorithm of Reluctance Launcher during Acceleration Process

Mengkun,

Junhong,

Xianglie

et al. 2023

IEEJ Transactions Elec Engng

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The structure of the reluctance electromagnetic launcher (REML) is equivalent to an inductor with a movable iron core. The dynamic current in the launching process is easy to be measured by instruments, but the data such as the position, velocity of the projectile and the equivalent inductance are not only difficult to solve by analytical methods, but also difficult to measure by instruments, which seriously hinders the development of the control technology. To solve this problem, referring to the method of introducing the inductance matrix into the motor algorithm model to realize semi-analytic calculation, a special algorithm model is proposed to calculate the launch process data of REML based on the current data. According to the working characteristics of the reluctance coil transmitter, it is pointed out that its inductance matrix should be specifically expressed as a three-dimensional data table rather than a traditional two-dimensional table. The current can be obtained by closed-loop calculation according to the proposed algorithm block diagram when the circuit parameters are known, or measured by instruments when the circuit parameters are unknown, and then the launch process data is obtained indirectly through calculation. In this study, an experimental platform was built, and the algorithm model was established using MATLAB/Simulink. The comparison of the dynamic launch process data of the finite element method (FEM) showed that the method was feasible.

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Section: Theoretical Analysis Of the Solving Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on Electromagnetic Dynamics Algorithm of Reluctance Launcher during Acceleration Process

Mengkun,

Junhong,

Xianglie

et al. 2023

IEEJ Transactions Elec Engng

View full text Add to dashboard Cite

show abstract

“…A multi-stage SICG (MSSICG) usually has the same parameters for components such as the driving coil and a projectile due to processing and cost constraints. Therefore, the feed time of each driving coil of an MSSICG becomes the crucial factor to determine the final muzzle velocity of the projectile [7][8][9], for which the number of coils can be increased to achieve the desired muzzle velocity. An inappropriate feed time often leads to undesirable outcomes.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Multistage Coilgun Based on Neural Network and Intelligent Algorithm

Yang

Tian

2023

Applied Sciences

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The parameter optimization of a multistage synchronous induction coilgun (SICG) is a time-consuming task. Traditional machine learning methods can accelerate the process by building predictive models, but they require separate modeling for an SICG with different stages, which requires numerous datasets and is a cumbersome process. This paper proposes a method for building a predictive model for an SICG with different stages based on a recurrent neural network (RNN). In this method, the feed time of a 2- to 10-stage SICG is selected from the standard orthogonal design table as the training and test datasets, and the current filament method (CFM) is used to calculate the dataset label. The gate recurrent unit (GRU) neural network is used to study the training dataset, and the predictive model has good accuracy with respect to the test dataset, with an average error of 0.022. The predictive model and a particle swarm optimization (PSO) algorithm are applied to optimize the feed time of the SICG with different stages. The results show that the three-stage SICG can achieve a muzzle velocity of 50 m/s for a projectile, while the maximum muzzle velocity of the three-stage SICG in all datasets is 46.87 m/s.

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“…Otherwise, the projectile will again be pulled back to the center of the coil [11]. This effect is called the suck-back effect [12][13][14][15][16]. It decreases the velocity of the projectile when it is out of the barrel.…”

Section: Introductionmentioning

confidence: 99%

Effect of Change of Reluctance Launcher Parameters on Projectile Velocity

Sari

2023

IEEE Access

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In this study, it is aimed to increase the projectile velocity by changing some parameters of the reluctance launcher. Studied parameters are the initial position of the projectile, the coating of the coil with ferrite, the coil length and the barrel outer diameter. A 3D Maxwell model of the reluctance launcher was generated to examine the effect of the change of these parameters on the projectile velocity. After the 3D model of the launcher was generated, analysis was done for each parameter. During the analysis for a parameter, the other parameters were kept constant. As a result of the analysis of the projectile position, it was determined that the projectile velocity is the highest when the projectile position is -2. It has been determined that the velocity of the projectile increases if the coil is coated with ferrite. It has been determined that the projectile velocity is the highest when the coil length is 7 cm. It has been determined that the highest projectile velocity is obtained when the barrel outer diameter is 18 mm. Using these results, the Maxwell model of the improved launcher was generated. The projectile velocity in the Maxwell model of the initial launcher is 19.24 m/sec. The projectile velocity of the improved launcher in the Maxwell model is 25.8 m/sec. By improving the launcher, a velocity increase of 34.09% was achieved. Later, this launcher was built and the parameters were investigated experimentally. In the experimental work, the projectile velocity of the initial launcher was measured as 19.11 m/sec, and the projectile velocity of the improved launcher was measured as 24.9 m/sec. As a result of the experimental work, a velocity increase of 30.29% was obtained by improving the launcher.

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Optimal Switching Scheme for Multistage Reluctance Coilgun

Cited by 13 publications

References 29 publications

Research on Electromagnetic Dynamics Algorithm of Reluctance Launcher during Acceleration Process

Research on Electromagnetic Dynamics Algorithm of Reluctance Launcher during Acceleration Process

Optimization of Multistage Coilgun Based on Neural Network and Intelligent Algorithm

Effect of Change of Reluctance Launcher Parameters on Projectile Velocity

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